Correct Option: B

Thermal power is the largest source of power in India. There are different types of Thermal power plants based on the fuel used to generate the steam such as coal, gas, Diesel etc. About 75% of the electricity consumed in India are generated by Thermal power plants. More than 50% of India’s commercial energy demand is met through the country’s vast coal reserves. Public sector undertaking National Thermal Power Corporation and several other state level power generating companies are engaged in operating coal based Thermal Power Plants.